Between that and FF.net some days I get NOTHING done. AO3 is good, but a lot of times it goes overboard on smutfic and it's hard to sort out things worth reading. Also unlike FF.net they lump crossovers into the same category which can make it hard to find things. There's some REALLY good anonymously-posed Moreta fic right now but it's buried in a bunch of "Marvel/anime/shows I've never heard of become dragonriders" fics.